Asymmetric Syntheses of (–)-ADMJ and (+)-ADANJ: the 2-Deoxy-2-amino Analogues of (–)-1-Deoxymannojirimycin and (+)-1-Deoxyallonojirimycin
The asymmetric syntheses of (–)-ADMJ and (+)-ADANJ, the 2-deoxy-2-amino analogues of (–)-1-deoxymannojirimycin and (+)-1-deoxyallonojirimycin, are described herein. Methodology for the ring-closing iodoamination of bishomoallylic amines followed by in situ ring-expansion (via intramolecular ring-ope...
| Main Authors: | , , , , |
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| Format: | Journal article |
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American Chemical Society
2016
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| Summary: | The asymmetric syntheses of (–)-ADMJ and (+)-ADANJ, the 2-deoxy-2-amino analogues of (–)-1-deoxymannojirimycin and (+)-1-deoxyallonojirimycin, are described herein. Methodology for the ring-closing iodoamination of bishomoallylic amines followed by in situ ring-expansion (via intramolecular ring-opening of the corresponding aziridinium intermediates with a tethered carbamate moiety) to give oxazolidin-2-ones was initially optimised on a model system. Subsequent application of this methodology to two enantiopure bishomoallylic amines (which were produced via aminohydroxylation of an α,β-unsaturated ester, partial reduction and reaction of the corresponding aldehyde with vinylmagnesium bromide) also proceeded with concomitant N-debenzylation to afford the corresponding diastereoisomerically pure (>99:1 dr) oxazolidin-2-ones. Subsequent deprotection of these enantiopure templates gave (–)-ADMJ and (+)-ADANJ as single diastereoisomers in 16 and 24% overall yield, respectively. |
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